delete all rows with certain entries

[excel456]

Suppose I have a column like this:

0
1
2
A
2
4
5
A
4
1
A

it's a list mostly of numbers, but with a few rows of letters randomly mixed in. I want to be able to automatically delete all the rows which contain letters. Is that possible?

[JieJenn]

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[JieJenn]

Try

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